I've been studying the number of options the avarage company offers, and it's almost always not more than 3, like shared hosting, reselling and dedicated or sometimes reselling, VPS and dedicated.
Since you need to learn the ropes, I'd recommend to focus on either shared or reselling, and then move to the new area.
In case you are considering reselling packages to start with, have a look at valuhost.com and ****************.net reselling options.